package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //新建一个菜品实体类，以便插入菜品
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //向菜品表插入一条菜品
        dishMapper.insert(dish);

        //获得insert语句执行后产生的主键值
        Long dishId = dish.getId();

        /**
         * 向口味表插入口味数据
         */
        //获得口味集合
        List<DishFlavor> flavors = dishDTO.getFlavors();
        //判断口味集合是否为空
        if(flavors != null && flavors.size() > 0){
            //为id 赋值
            flavors.forEach(item -> item.setDishId(dishId));
            //批量插入口味数据
            dishFlavorMapper.insertBatch(flavors);
            }
    }
    /**
    * 菜品分页查询
    * @param dishPageQueryDTO
    * @return
    */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否能够删除？--》是否处于起售状态
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            Integer status = dish.getStatus();
            if(status == 1){
                //处于起售状态，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断菜品是否能够删除？--》是否关联了套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            //关联了套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }


        //删除菜品表中的数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            dishFlavorMapper.deleteByDishId(id);

        }*/
        dishMapper.deleteBatch(ids);
        dishFlavorMapper.deleteBatchByDishIds(ids);




    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);

        //封装到VO对象并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品和口味数据
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品基本信息
        dishMapper.update(dish);
        //删除口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //新增口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            //为id 赋值
            flavors.forEach(item -> item.setDishId(dish.getId()));
            //批量插入口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public List<DishVO> getDishesByCategoryId(Long categoryId) {
        return dishMapper.getDishesByCategoryId(categoryId);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
